At a glance
Short answer
Choosing solar panels cannot be judged from one national average; use the figures below as context and rely on a property survey, an itemised quotation and the rules that apply where you live.
What this guide covers
This page brings together choosing solar panels, monocrystalline vs polycrystalline, bifacial solar panels, standard vs all black panels, solar panel efficiency, preparing you to compare written proposals without treating general guidance as a site-specific design.
For choosing solar panels, start with an unshaded roof survey, its usable area, orientation and pitch; A generation forecast should state the proposed array size, inverter assumptions and losses rather than relying on a national average.
Current reference figures
- 4.5 kWp: For choosing solar panels, energy Saving Trust describes a typical domestic solar system as about 4.5 kWp. Official context (accessed 27 September 2026).
- 12 panels: For choosing solar panels, that example uses roughly 12 panels. Official context (accessed 27 September 2026).
- £7,600: For choosing solar panels, its September 2026 typical installed-cost figure is about £7,600. Official context (accessed 27 September 2026).
For choosing solar panels, these numbers are comparison anchors rather than promised costs, savings or performance; confirm the date, eligibility conditions and property assumptions behind every figure in a quotation.
How to compare proposals
For choosing solar panels, compare quotations on the same system boundary: panels, inverter, mounting, scaffolding, electrical work, monitoring, permissions, commissioning and making good; Record anything that remains an allowance.
For choosing solar panels, ask for monthly generation as well as an annual total; Seasonal output, household demand and the export assumption determine whether the forecast is useful for this particular home.
Worked household example
A three-bedroom semi-detached household in Leeds is assessing choosing solar panels, so it records present energy use and asks three suppliers to quote the same scope; one quotation is set aside because access work and commissioning are omitted, a second gives a plausible headline result without its supporting calculation, and the third progresses because its survey, assumptions, exclusions, warranties and responsibilities can be checked line by line.
This choosing solar panels example does not identify a universally best product; it demonstrates why comparable evidence should influence the decision before the equipment choice does.
UK rules and responsibilities
For choosing solar panels, check which planning, network, consumer-protection and funding requirements apply in the relevant UK nation; confirm the council, network operator and scheme administrator before signing, and request written cancellation information for a distance or off-premises contract.
Questions to ask
- What property evidence supports this recommendation?
- Which calculations determine the proposed specification?
- What work and permissions are excluded?
- Which warranties apply, and who handles claims?
- What commissioning evidence will I receive?
- Which current standards govern the work?
Independent sources
- Energy Saving Trust solar guidance (accessed 27 September 2026).
- MCS solar PV guidance (accessed 27 September 2026).
Last updated .